| Description | Date | Identifier | |
| Suggestions from Mr. Royce regarding the design and material of connecting rod and main bearing liners. | 28th Jan 1918 | West Wittering \ B \ January1918 Scan18 | |
| Review of recent suggestions from Derby concerning material changes for various components. | 28th Jan 1918 | West Wittering \ B \ January1918 Scan19 | |
| Proposal to send a letter to the Technical Controller of the Air Board regarding the testing of R.R.C.H. carburettors. | 30th Jan 1918 | West Wittering \ B \ January1918 Scan20 | |
| Letter outlining the required features for testing a new Zenith carburettor against the existing R.R.C.H. model. | 30th Jan 1918 | West Wittering \ B \ January1918 Scan21 | |
| Carburettor performance concerning petrol collection from flooding. | 30th Jan 1918 | West Wittering \ B \ January1918 Scan22 | |
| Effects of increased compression ratios on engine performance and exhaust cooling. | 5th Jul 1918 | West Wittering \ B \ July1918 Scan0 | |
| Explaining the potential cause for the breakage of planet bolts and suggesting solutions. | 6th Jul 1918 | West Wittering \ B \ July1918 Scan1 | |
| Inquiry into the cause of a broken planet bolt, possibly due to incorrect washer bedding. | 6th Jul 1918 | West Wittering \ B \ July1918 Scan2 | |
| Confirmation of a telegram suggesting design changes to a plain rod bearing to reduce wear. | 15th Jul 1918 | West Wittering \ B \ July1918 Scan3 | |
| Modifications to strengthen steering pivots after a component failure. | 30th Jul 1918 | West Wittering \ B \ July1918 Scan4 | |
| Modifications to a pin and pivot, stress calculations, and instructions to fit new pivots on the Duke of Westminster's car. | 30th Jul 1918 | West Wittering \ B \ July1918 Scan5 | |
| Implications of centre point steering on front wheel track and jacking procedures. | 30th Jul 1918 | West Wittering \ B \ July1918 Scan6 | |
| Cause of a front pivot breakage and proposed design modifications to increase strength. | 30th Jul 1918 | West Wittering \ B \ July1918 Scan7 | |
| Procedure for examining and replacing cracked front pivots on cars. | 30th Jul 1918 | West Wittering \ B \ July1918 Scan8 | |
| Design sketch for a box spanner made from bar with a broached hexagon. | 13th Jun 1918 | West Wittering \ B \ June1918 Scan0 | |
| Proposal to redesign box spanners from a tubular form to a broached, single-ended design for a better fit. | 13th Jun 1918 | West Wittering \ B \ June1918 Scan1 | |
| Design change for planet bolts to reduce the risk of breakage. | 16th Jun 1918 | West Wittering \ B \ June1918 Scan2 | |
| Request to obtain a set of valve stem lubricators for an Eagle engine and a car engine. | 20th Jun 1918 | West Wittering \ B \ June1918 Scan3 | |
| Letter from Brown Brothers Ltd. offering a free set of 'DUCO' valve stem lubricators for testing on post-war models. | 15th Jun 1918 | West Wittering \ B \ June1918 Scan4 | |
| Response to a complaint about high tension terminal connections to a Watford magneto, suggesting potential operator error. | 5th Mar 1918 | West Wittering \ B \ March1918 Scan0 | |
| Increasing the running time limit for aluminium pistons before replacement. | 12th Mar 1918 | West Wittering \ B \ March1918 Scan1 | |
| Acknowledging receipt and quality of a relief valve. | 25th Mar 1918 | West Wittering \ B \ March1918 Scan2 | |
| Design of high-tension terminals, concluding that a pattern where a screw pierces insulation is the best available option. | 15th Mar 1918 | West Wittering \ B \ March1918 Scan3 | |
| Confirmation of a telegram regarding testing a starter motor to improve BHP and efficiency. | 26th Mar 1918 | West Wittering \ B \ March1918 Scan4 | |
| Fatigue break in an engine's connecting rods. | 26th Mar 1918 | West Wittering \ B \ March1918 Scan5 | |
| Confirmation of a telegram regarding carburettor and manifold specifications. | 27th Mar 1918 | West Wittering \ B \ March1918 Scan6 | |
| Request for data on the behaviour and life of Ferodo brakes and clutches when operating under oily conditions. | 8th Nov 1918 | West Wittering \ B \ November1918 Scan0 | |
| Confirmation of a telegram regarding cars and availability. | 18th Nov 1918 | West Wittering \ B \ November1918 Scan1 | |
| Notification that Mr. Royce agrees to an alteration in the material for hand starter gears. | 12th Oct 1918 | West Wittering \ B \ October1918 Scan0 | |
| Cageless ball bearings made in France and their suitability for epicyclic gears. | 22th Oct 1918 | West Wittering \ B \ October1918 Scan1 | |
| The difficulty of identifying the manufacturer of a syringe-type acid hydrometer mentioned in an 'Autocar' magazine article. | 11th Sep 1918 | West Wittering \ B \ September1918 Scan0 | |
| Mr. Caldwell's patent for a vaporiser carburettor for heavy fuels. | 11th Sep 1918 | West Wittering \ B \ September1918 Scan1 | |
| Use of copper versus silicon bronze for ignition plugs. | 16th Sep 1918 | West Wittering \ B \ September1918 Scan2 | |
| Gasoline feeding device sent for testing, with Mr. Royce's opinion that it is likely not of much use. | 27th Sep 1918 | West Wittering \ B \ September1918 Scan3 | |
| Gasoline feeding device invented by Mr. Twombley of New York. | 17th May 1918 | West Wittering \ B \ September1918 Scan4 | |
| Analysis of the design and performance of a peculiar flat disc valve and pump mechanism for automobiles, invented by Mr. Twambley. | 14th Oct 1918 | West Wittering \ B \ September1918 Scan5 | |
| New gasoline feeding device using a plunger and a proposal for its manufacture under a royalty agreement. | 14th Oct 1918 | West Wittering \ B \ September1918 Scan6 | |
| Confirmation of a telegram regarding an urgent test of epicyclic planets using ball bearings instead of roller bearings. | 30th Sep 1918 | West Wittering \ B \ September1918 Scan7 | |
| The dispatch of a drum of benzol to West Wittering. | 1st Apr 1919 | West Wittering \ C \ April1919 Scan0 | |
| Experiment on a clutch, comparing a sheet steel pressing with a light aluminium centre for the driven member. | 8th Apr 1919 | West Wittering \ C \ April1919 Scan1 | |
| Telegram confirmation from Royce requesting an experimental solution for keeping oil off brakes. | 3rd Apr 1919 | West Wittering \ C \ April1919 Scan2 | |
| Solution for an issue with a packing washer in an improved epicyclic gear assembly. | 4th Apr 1919 | West Wittering \ C \ April1919 Scan3 | |
| Blueprint showing a cross-sectional view of a mechanical assembly with part numbers and handwritten notes. | 7th Apr 1919 | West Wittering \ C \ April1919 Scan4 | |
| Listing the design status of various 20 HP chassis components and their development location. | 7th Apr 1919 | West Wittering \ C \ April1919 Scan5 | |
| Outlining Mr. Royce's requests for design schemes on the 20 HP chassis, covering various components and ignition systems. | 4th Apr 1919 | West Wittering \ C \ April1919 Scan6 | |
| Requesting a set of box spanners and clarifying their standardisation for both cars and aero engines. | 7th Apr 1919 | West Wittering \ C \ April1919 Scan7 | |
| Mr. Royce's approval and suggestions for a new form of joint for the magneto drive. | 10th Apr 1919 | West Wittering \ C \ April1919 Scan8 | |
| Design progress of road shock dampers for the rear and front axles. | 9th Apr 1919 | West Wittering \ C \ April1919 Scan9 | |
| The design and positioning of louvres for future radiators. | 9th Apr 1919 | West Wittering \ C \ April1919 Scan10 | |
| The design, materials, and mounting for a 20 HP radiator suspension system. | 10th Apr 1919 | West Wittering \ C \ April1919 Scan11 | |
| Modifications to the 20 HP radiator suspension system. | 9th Apr 1919 | West Wittering \ C \ April1919 Scan12 | |
| The 20 HP starter motor and dynamo, requesting the creation of full-scale models for the windings and armatures. | 10th Apr 1919 | West Wittering \ C \ April1919 Scan13 | |
| Design of the 20 HP chassis dynamo and starter motor, requesting models of the brush holders be made. | 1st Apr 1919 | West Wittering \ C \ April1919 Scan14 | |
| Use of leather or fabric for a magneto coupling and a flanged coupling for easier maintenance. | 11th Apr 1919 | West Wittering \ C \ April1919 Scan15 | |
| Proposal to test a split boss lever secured by a biting-in bolt for a 40/50 HP progressive shock damper. | 14th Apr 1919 | West Wittering \ C \ April1919 Scan16 | |
| Design and specifications for a 40/50 HP pressure feed pump. | 19th Apr 1919 | West Wittering \ C \ April1919 Scan17 | |
| Slider clearance, valve lift, balance weights, and pump standardisation. | 1st Apr 1919 | West Wittering \ C \ April1919 Scan18 | |
| The design of the RE 20 HP engine bearer arms and a request to create drawings. | 19th Apr 1919 | West Wittering \ C \ April1919 Scan19 | |
| Sending drawing No. Lec.1078 concerning the 20 HP crankcase and oil system. | 17th Apr 1919 | West Wittering \ C \ April1919 Scan20 | |
| Alterations to a bracket and brake lever spindle for the 40/50 HP chassis. | 28th Apr 1919 | West Wittering \ C \ April1919 Scan21 | |
| Suitability of a wiring tube for battery ignition on a 40/50 HP chassis. | 1st Apr 1919 | West Wittering \ C \ April1919 Scan22 | |
| Requesting specimens of 'bakerised linen' for testing its suitability for use in contact breakers. | 9th Aug 1919 | West Wittering \ C \ August1919 Scan0 | |
| Alternative design schemes for the 20 HP model's brake gear. | 4th Aug 1919 | West Wittering \ C \ August1919 Scan1 | |
| Sending a full-scale drawing (Lec.1119) for a 20 HP rear spring pivot. | 4th Aug 1919 | West Wittering \ C \ August1919 Scan2 | |
| Drawing No. LeC.1126 for the RE 20 HP rear spring pivots. | 9th Aug 1919 | West Wittering \ C \ August1919 Scan3 | |
| Faulty Buick battery, detailing cell failures and requesting an examination. | 9th Aug 1919 | West Wittering \ C \ August1919 Scan4 | |
| Modifications to the main oil feed pipe to prevent dirt settlement on the 20 HP engine. | 15th Aug 1919 | West Wittering \ C \ August1919 Scan5 | |
| The design and construction of a switch box for a 40/50 HP electrical system. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan6 | |
| From 'E' to 'EFC' requesting a blueprint of drawing LeC.1127 and putting the main design on hold. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan7 | |
| Response to a report on the Smith Dynamo, suggesting further comparative tests and commenting on workmanship and materials. | 22th Aug 1919 | West Wittering \ C \ August1919 Scan8 | |
| Use and cost of lubricating oil, recommending Wakefields Castrol for its high castor oil content. | 21th Aug 1919 | West Wittering \ C \ August1919 Scan9 | |
| Mr. Royce's requested alterations for ignition clips, the magneto, tool kit, and spare fuel storage. | 25th Aug 1919 | West Wittering \ C \ August1919 Scan10 | |
| (page 2) detailing feedback from Mr. Royce on the spare wheel fitting, bonnet ledge material, and inquiring about tool kit components. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan11 | |
| Fitting of the temperature indicator and the arrangement of the instrument board. | 25th Aug 1919 | West Wittering \ C \ August1919 Scan12 | |
| Layout of dashboard electrical components and securing wiring, referencing scheme LeC.1121 and a conversation with Mr. Royce. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan13 | |
| Feedback and proposed design changes for a shock absorber on a 40/50 HP chassis. | 25th Aug 1919 | West Wittering \ C \ August1919 Scan14 | |
| List of numbered technical notes and modifications for various mechanical components, including a sketch. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan15 | |
| Alterations to sockets and the grease way lubrication system for a ball joint assembly. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan16 | |
| Required alterations to the starter switch on Chassis 1 EX. | 25th Aug 1919 | West Wittering \ C \ August1919 Scan17 | |
| Continued list of numbered technical points and suggestions regarding electrical components and wiring. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan18 | |
| Alterations to the dashboard and dissatisfaction with the wiring and clips. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan19 | |
| Investigating the suitability of low tension conductors for the 40/50 HP chassis electrical system. | 25th Aug 1919 | West Wittering \ C \ August1919 Scan20 | |
| Importance of cable sizes for terminal fittings on distribution and switch boards. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan21 | |
| Suitability of using Ford-sized tyres on a 20 HP chassis. | 25th Aug 1919 | West Wittering \ C \ August1919 Scan22 | |
| Applying the die-cast design of crankshaft oil caps from Eagle engines to the 20 HP engine. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan23 | |
| Describing the design and proposed manufacturing process for sheet metal terminals. | 26th Nov 1919 | West Wittering \ C \ August1919 Scan24 | |
| Modified coupling and mounting for the 20 HP magneto drive and strap. | 26th Aug 1919 | West Wittering \ C \ August1919 Scan25 | |
| Design simplification for the 20 HP oil pump drive. | 27th Aug 1919 | West Wittering \ C \ August1919 Scan26 | |
| The incorrect tyre valve position on chassis 1 EX and the correct placement procedure. | 29th Aug 1919 | West Wittering \ C \ August1919 Scan27 | |
| Progress report on the experimental construction and testing of condensers, detailing previous test failures and a new proposed procedure. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan29 | |
| On condenser testing procedures, discussing issues with 'Stickoline' varnish and potential alternatives. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan30 | |
| Typed continuation page of a memorandum or letter, page number 3. | 1st Aug 1919 | West Wittering \ C \ August1919 Scan31 | |
| Drawing Lec.1120 for the camshaft drive on a 20 HP chassis, detailing its unitary removal. | 7th Aug 1919 | West Wittering \ C \ August1919 Scan32 | |
| The testing of a new Tudor battery and plans to engage with Chloride for a competing product. | 7th Aug 1919 | West Wittering \ C \ August1919 Scan33 | |
| Continued report evaluating P. & R. and Premier batteries, detailing their physical specifications and performance results. | 7th Aug 1919 | West Wittering \ C \ August1919 Scan34 | |
| Continuation of a report on battery capacity tests. | 7th Aug 1919 | West Wittering \ C \ August1919 Scan35 | |
| Steering gear and front spring fractures during chassis rig testing. | 11th Aug 1919 | West Wittering \ C \ August1919 Scan36 | |
| Analysis of a fractured road spring, detailing its chemical composition and Brinell hardness test results. | 11th Aug 1919 | West Wittering \ C \ August1919 Scan37 | |
| The Smith (T & M) Type 'A' Dynamo. | 13th Aug 1919 | West Wittering \ C \ August1919 Scan39 | |
| Hand-drawn electrical schematic diagram for a dynamo or motor. | 16th Apr 1919 | West Wittering \ C \ August1919 Scan40 | |
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